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What investing theme does Cramer say is the "best" he's ever seen in his life? It's the mobile Internet theme, and it's the latest in his list of the most important investing themes of the year. The same theme he's been highlighting all week.

The Dollar Index is up for a second day in a row on Treasury Secretary Geithner's comments that the administration is committed to a stronger dollar. Despite the small gain, the US Dollar is now down over 15% since March relative to a basket of foreign currencies and many traders are betting it will continue its slide.

Stocks skidded at the open Friday as disappointing results from Bank of America and General Electric eclipsed strong results from big techs. They slid further — with the Dow down 100 points — after a report showed a surprise drop in consumer sentiment.

Stocks pared their losses Thursday after a third straight positive Philly Fed reading — the first time that's happened in two years. Stocks had opened lower after disappointment in earnings from Goldman Sachs and Citigroup.